There are two interesting things about the arrest of Rebekah Brooks and her husband Charlie early this morning.
She had already been arrested last year by the inquiries into phone hacking and police corruption.
But this is an arrest on a different issue. It is conspiracy to pervert the course of justice.
And that is a serious allegation. Her former PA Cheryl Carter was arrested on this issue last year.
The other interesting element with these arrests is the political dimension.
David Cameron was dragged into the hacking scandal with his appointment of Andy Coulson.
The recent horsegate story, although on the face of it initially silly, did point up the close links between the Met, Rebekah Brooks, her husband Charlie Brooks, and the Prime Minister.
Mr Cameron had to admit he had ridden the former police horse Raisa, with his Eton schoolfriend Charlie Brooks.
It is another person close to Mr Cameron now arrested in this inquiry.